Fair Value Measurements (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
Mar. 31, 2015	Dec. 31, 2014
Quantitative Information about Level 3 Fair Value Measurements
Impaired loans	27,890	26,586
Non-recurring basis \| Level 3
Quantitative Information about Level 3 Fair Value Measurements
Impaired loans	1,820	2,129
OREO	208
Non-recurring basis \| Level 3 \| Appraisal of collateral \| Impaired loans
Quantitative Information about Level 3 Fair Value Measurements
Impaired loans	1,820	2,129
Non-recurring basis \| Level 3 \| Appraisal of collateral \| Impaired loans \| Minimum
Quantitative Information about Level 3 Fair Value Measurements
Appraisal adjustments (as a percent)	(6.90%)	(7.70%)
Non-recurring basis \| Level 3 \| Appraisal of collateral \| Impaired loans \| Maximum
Quantitative Information about Level 3 Fair Value Measurements
Appraisal adjustments (as a percent)	(100.00%)	(100.00%)
Non-recurring basis \| Level 3 \| Appraisal of collateral \| Impaired loans \| Weighted Average
Quantitative Information about Level 3 Fair Value Measurements
Appraisal adjustments (as a percent)	(51.10%)	(54.30%)
Non-recurring basis \| Level 3 \| Appraisal of collateral \| OREO
Quantitative Information about Level 3 Fair Value Measurements
OREO	208
Non-recurring basis \| Level 3 \| Appraisal of collateral \| OREO \| Minimum
Quantitative Information about Level 3 Fair Value Measurements
Appraisal adjustments (as a percent)	(32.70%)
Non-recurring basis \| Level 3 \| Appraisal of collateral \| OREO \| Maximum
Quantitative Information about Level 3 Fair Value Measurements
Appraisal adjustments (as a percent)	(100.00%)
Non-recurring basis \| Level 3 \| Appraisal of collateral \| OREO \| Weighted Average
Quantitative Information about Level 3 Fair Value Measurements
Appraisal adjustments (as a percent)	(84.70%)

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Percentage of adjustment to the observed price for a similar asset or liability when an identical transaction does not exist, used as an input to measure fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 14A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953550-111524

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- Definition

Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4437-111522

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 28

-Article 12

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph c

-Subparagraph Schedule III

-Article 5

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